SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT
SMC 685 Hastelloy Poly Check Valve 1/2" NPT
Polypropylene inline check valve with Viton seals and Hastelloy springs for reliable backflow prevention in demanding water treatment applications
Built for Corrosive Environments
Hastelloy Spring
Corrosion-resistant Hastelloy spring maintains consistent closing force even in aggressive chemical environments where standard stainless would fail
Viton Seals
Fluoroelastomer seals provide excellent chemical compatibility and temperature resistance from 0°F to 250°F for reliable shut-off
Polypropylene Body
Chemically inert PP construction resists degradation from acids, bases, and sanitizers common in water treatment systems
Inline Design
Compact inline configuration with 1/2" female NPT connections on both ends installs easily in tight spaces without adapters
125 PSI Rating
Rated for 125 PSI working pressure handles most municipal and well water applications with margin for pressure spikes
Technical Details
| Model Number | SMC 6850490 |
| Valve Type | 685 Series Inline Check Valve |
| Pipe Size | 1/2 inch |
| End Connections | FNPT x FNPT (Female NPT both ends) |
| Body Material | Polypropylene |
| Spring Material | Hastelloy |
| Seal Material | Viton (FKM) |
| Pressure Rating | 125 PSI WOG |
| Temperature Range | 0°F to 250°F |
Application Fit
The SMC 6850490 check valve installs in any system requiring 1/2" NPT backflow prevention. Common applications include RO system permeate lines, chemical dosing pump discharge, booster pump outlets, and storage tank connections. The Hastelloy spring and Viton seals handle chlorinated water, dilute acids and bases, sanitizers, and most industrial water treatment chemicals. Use where standard brass or stainless valves show corrosion or seal degradation.
Chemical Compatibility
Materials resist chlorine, acids, caustics, and sanitizers
Standard Threads
1/2" NPT female threads fit common pipe and fittings
No Maintenance
Spring-loaded design requires no adjustment or servicing
SMC Quality
Manufactured to industrial standards for long service life
SMC 685 Hastelloy Poly Check Valve 1/2" NPT
Polypropylene inline check valve with Viton seals and Hastelloy springs for reliable backflow prevention in demanding water treatment applications
Built for Corrosive Environments
Hastelloy Spring
Corrosion-resistant Hastelloy spring maintains consistent closing force even in aggressive chemical environments where standard stainless would fail
Viton Seals
Fluoroelastomer seals provide excellent chemical compatibility and temperature resistance from 0°F to 250°F for reliable shut-off
Polypropylene Body
Chemically inert PP construction resists degradation from acids, bases, and sanitizers common in water treatment systems
Inline Design
Compact inline configuration with 1/2" female NPT connections on both ends installs easily in tight spaces without adapters
125 PSI Rating
Rated for 125 PSI working pressure handles most municipal and well water applications with margin for pressure spikes
Technical Details
| Model Number | SMC 6850490 |
| Valve Type | 685 Series Inline Check Valve |
| Pipe Size | 1/2 inch |
| End Connections | FNPT x FNPT (Female NPT both ends) |
| Body Material | Polypropylene |
| Spring Material | Hastelloy |
| Seal Material | Viton (FKM) |
| Pressure Rating | 125 PSI WOG |
| Temperature Range | 0°F to 250°F |
Application Fit
The SMC 6850490 check valve installs in any system requiring 1/2" NPT backflow prevention. Common applications include RO system permeate lines, chemical dosing pump discharge, booster pump outlets, and storage tank connections. The Hastelloy spring and Viton seals handle chlorinated water, dilute acids and bases, sanitizers, and most industrial water treatment chemicals. Use where standard brass or stainless valves show corrosion or seal degradation.
Chemical Compatibility
Materials resist chlorine, acids, caustics, and sanitizers
Standard Threads
1/2" NPT female threads fit common pipe and fittings
No Maintenance
Spring-loaded design requires no adjustment or servicing
SMC Quality
Manufactured to industrial standards for long service life
Original: $18.11
-65%$18.11
$6.34Description
SMC 685 Hastelloy Poly Check Valve 1/2" NPT
Polypropylene inline check valve with Viton seals and Hastelloy springs for reliable backflow prevention in demanding water treatment applications
Built for Corrosive Environments
Hastelloy Spring
Corrosion-resistant Hastelloy spring maintains consistent closing force even in aggressive chemical environments where standard stainless would fail
Viton Seals
Fluoroelastomer seals provide excellent chemical compatibility and temperature resistance from 0°F to 250°F for reliable shut-off
Polypropylene Body
Chemically inert PP construction resists degradation from acids, bases, and sanitizers common in water treatment systems
Inline Design
Compact inline configuration with 1/2" female NPT connections on both ends installs easily in tight spaces without adapters
125 PSI Rating
Rated for 125 PSI working pressure handles most municipal and well water applications with margin for pressure spikes
Technical Details
| Model Number | SMC 6850490 |
| Valve Type | 685 Series Inline Check Valve |
| Pipe Size | 1/2 inch |
| End Connections | FNPT x FNPT (Female NPT both ends) |
| Body Material | Polypropylene |
| Spring Material | Hastelloy |
| Seal Material | Viton (FKM) |
| Pressure Rating | 125 PSI WOG |
| Temperature Range | 0°F to 250°F |
Application Fit
The SMC 6850490 check valve installs in any system requiring 1/2" NPT backflow prevention. Common applications include RO system permeate lines, chemical dosing pump discharge, booster pump outlets, and storage tank connections. The Hastelloy spring and Viton seals handle chlorinated water, dilute acids and bases, sanitizers, and most industrial water treatment chemicals. Use where standard brass or stainless valves show corrosion or seal degradation.
Chemical Compatibility
Materials resist chlorine, acids, caustics, and sanitizers
Standard Threads
1/2" NPT female threads fit common pipe and fittings
No Maintenance
Spring-loaded design requires no adjustment or servicing
SMC Quality
Manufactured to industrial standards for long service life
